According to Reuters, democratic presidential hopeful Amy Klobuchar on Saturday called for revamping the Environmental Protection Agency’s rules governing how refineries use ethanol in gasoline products. Klobuchar, a U.S. senator, said the EPA’s waivers that allow refineries to avoid the requirements are “misguided” and said financial institutions are manipulating the biofuels credit trading market. Klobuchar also called for new compliance standards and additional oversight.